I swapped out my fluids including the oil filter(all of them excluding the coolant and brake fluid) at 10 hrs and im sitting at 23 hrs right now....I'll be doing an oil change with a new filter and re-charging the air filter.
The 20 hr service also includes a valve check....now, coming from a Yamaha R6...we didn't do valves until 26k miles, lol. The Viking uses a different setup on the valves which are more prone to walking out of spec.....some people say it's not necessary but I've heard of people that DO, do it and they had a couple out of spec.
IMHO....it's somewhat of cheap insurance to get the valves checked. I'll be taking mine in to my local bike shop almost disassembled so all he has to do is remove some bolts, check valves and reassemble. I think my shop quoted me about $150 to do this.
20hr/200 miles change the oil/filter and the diff fluids... Wait between 500 to 1000 miles on top of that to touch it again.. Depending on how hard you beat on it... Wouldn't worry bout valves till at least 2k miles... Had several yamahas and that's when they usually develop the "tick" of needing some minor valve adjustment. Just my opinion
^^^^^this! My dealer recommended the same thing, 20hr/200 miles: all fluids and filters except coolant 100hr/500 miles: regular service and check the valves. He said so for all of the Vikings they have sold needed no adjustment and that they haven't had any problems mechanically.